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Old 08-11-2009, 09:29 PM   #1
gottaride28
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code p0128

i was driving on the highway today and i got a check engine light for p0128 well i guess this has to do with the thermostat. Well the car is blowing hot air so im gonna guess that the thermostat would be not opening. I could be completely wrong in this too but this is only a guess but the radiator and the coolant hose that connects to the bypass on the right side of the motor and goes to the top right of the radiator are both hot as well as the hoses that come off the resivor. So i could be mistaking but wouldnt that mean that the thermostat would be open? b/c only way to get to that side the motor would be if the thermostat was open unless all the coolant is getting back up. But if this was to happen wuoldnt the gauge inside the car be pinning itself to hot? The gauge on the instrument cluster is right where it always has right in the middle and every time the car is cold its low and when it warms up it stays in the middle... even when the light came on it still didnt driectly over heat. So Im a little confused whats going on. Any insight to this issue would be a huge help!

Also the sensor that is in the middle of the head, was made for a 2.3 ranger. I did a motor swap only about 2k miles ago and it was a BRAND NEW motor so new sensors and thermostat so thats another thing i dont understand. Should i switch the sensors from my focus you think into the 2.3 ranger head?

Thanks
Zack


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Old 08-11-2009, 10:27 PM   #2
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Have you datalogged your coolant temp? Just to see what its doing.
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Old 08-11-2009, 10:38 PM   #3
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http://www.focusfanatics.com/forum/showthread.php?t=147485

if the codes stayed the same between the years... i duno im not much for diagnostics :\
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Old 08-11-2009, 10:45 PM   #4
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Have you datalogged your coolant temp? Just to see what its doing.
I didnt think of doing that, but i cant do that till i get home :(

ive had this happen once before and the instrument cluster guage pin itself hot but when i felt that happen the radiator was cold and the one hose that i was describing on the right top side of the radiator was cold. I fixed that by squeezing the radiator hose and resting the code and its has stay off since then. But like i was saying this time around the hoses are hot so thermostat has to be opening.
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Old 08-11-2009, 10:46 PM   #5
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http://www.focusfanatics.com/forum/showthread.php?t=147485

if the codes stayed the same between the years... i duno im not much for diagnostics :\
i had seen that thread i did a search but that didnt tell me much.
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Old 08-11-2009, 10:47 PM   #6
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Id log the temps like ill said to see whats up. It might be how you connected the sensors. Chris told me you had to modify it to work or something. Might also be a miscommunication between the sensor and the focus ecu?(Just a guess i have nothing to back this up.) IM not as much help with the duratec head, esp your setup.
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Old 08-11-2009, 10:54 PM   #7
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Well you can always change the temperature sensor transfer function in the tune. That might be easier than changing sensors. See if Randy will look up the xfer func from a ranger and put it in your tune to try it out.

Also the temp gauge on the dash is a friggen dummy gauge, if you see that start to go to the right of center it is already too late. That happens at about 250-260F.
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Old 08-11-2009, 10:55 PM   #8
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thanks jeff your a sweetheart ;)
yah i was talking to kyle and we kinda came to that conclusiion as well maybe.

does anyone know what the operating tempatures should be just around so i know what im looking for?
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Old 08-11-2009, 10:56 PM   #9
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anything from 180 to about 230 is ok, above 230 you should be concerned, above 240 shut the engine off and open the hood.
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Old 08-11-2009, 10:57 PM   #10
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Quote:
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Well you can always change the temperature sensor transfer function in the tune. That might be easier than changing sensors. See if Randy will look up the xfer func from a ranger and put it in your tune to try it out.

Also the temp gauge on the dash is a friggen dummy gauge, if you see that start to go to the right of center it is already too late. That happens at about 250-260F.
kyle was saying that thing is worthless but i mean it has to help a little.... i mean if it was to over heat that thing would pin itself to the right and its not doing that. Also its always starts all the way down and creeps up when the car warms up so i would assume that the gauge isnt malfunctioning.

but im not sure what any of that stuff means above but ill mention that to randy and see what we can do for sure!
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